Abdominal exercise device



FIG. 1 is a perspective view of an abdominal exercise device showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a front elevation view thereof;

FIG. 8 is a perspective view of an abdominal exercise device showing our new design, with unclaimed environment removed for clarity of disclosure;

FIG. 9 is a top plan view thereof;

FIG. 10 is a bottom plan view thereof;

FIG. 11 is a right side elevation view thereof; and,

FIG. 12 is a left side elevation view thereof.

The broken lines illustrate environmental elements of the abdominal exercise device which form no part of the claimed design. 

CLAIM The ornamental design for an abdominal exercise device, as shown and described. 